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167 PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW whereupon the court shall have jurisdiction to direct such person to appear before the department or its agent, or before a referee or the board at a time and place fixed by the court, and give such testimony and produce such books, papers, correspondence, memoranda, and other records as may be required, or to issue to such person its subpoena requiring such person to appear before the court at a time fixed and there to give testimony touching the matter under investigation, or to produce such other evidence as may be required. Any person who shall, without just cause, fail, neglect, or refuse to obey a subpoena or order of the court or who shall, without just cause, fail or refuse to attend and testify or to answer any lawful inquiry or to produce books, papers, correspondence, memoranda, and other records, if it is in his power so to do, in obedience to a subpoena or an order of the court may be punished by said court for contempt. (507 amended May 18, 1937, P.L.658, No.175) Section 508. Protection Against Self-Incrimination.--No person shall be excused from attending or testifying, or from producing books, papers, correspondence, memoranda, and other records before the department, the board, or any referee or court, in obedience to any summons or subpoena, on the ground that the testimony or evidence, documentary or otherwise, required of him may tend to incriminate him or subject him to a penalty or forfeiture; but no individual shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter or thing concerning which he is compelled, after having claimed his privilege against self-incrimination, to testify or produce evidence, except that such individual shall not be exempt from prosecution and punishment for perjury committed in so testifying. Section 509. Finality of Decisions.--Any decision made by the department or any referee or the board shall not be subject to collateral attack as to any application claim or claims covered thereby or otherwise be disturbed, unless appealed from. Subject to appeal proceedings and judicial review, any right, fact or matter in issue which was directly passed upon or necessarily involved in any decision of a referee or the board or the Court and which has become final shall be conclusive for all purposes of this act and shall not be subject to collateral attack as among all affected parties who had notice of such decision: Provided, however, That whenever an appeal involves a question as to whether services were performed by a claimant in employment or for an employer or whether remuneration paid constituted wages, a decision thereon shall not be conclusive as to an employing entity's liability for contributions unless the employing entity was given special notice of such issue and of the pendency of the appeal and was afforded a reasonable opportunity by the referee or the board to adduce evidence bearing on such question. No finding